another small fix

changelog.txt

@@ -58,5 +58,5 @@ Date: 2020-11-28
     - Added menu/gui to save and load squad configurations
     - Added Spidertron link tool (Link squads to an entity)
     - Added mod option to override the default tool/remote given by shortcut
-    - 3NOTICE: THIS VERSION IS A WORK IN PROGRESS - CHANGELOG IS NOT FINAL
-    - 4NOTICE: THIS VERSION IS A WORK IN PROGRESS - CHANGELOG IS NOT FINAL
+    - Added mod option to disable player alerts
+    - _NOTE: BETA RELEASE - USE AT YOUR OWN RISK!

control/player_select.lua

@@ -42,7 +42,9 @@ end
 local function unitNumbers(entities)
     local ids = {}
     for i = 1, #entities do
-        ids[#ids+1] = entities[i].unit_number
+        if entities[i].valid then
+            ids[#ids+1] = entities[i].unit_number
+        end
     end
     return ids
 end